1. Georgia Institute of Technology, Materials Science and Engineering 1 , Atlanta, Georgia 30332, USA
2. Department of Physics, Technical University of Munich 2 , Munich 80333, Germany
3. Departamento de Física, Universidad del Valle 3 , Cali 76001, Colombia
4. Departamento de Ingeniería Bioquímica, Universidad Icesi 4 , Cali 76001, Colombia
5. Chair for Composite, Materials, Faculty of Engineering, Kiel University 5 , Kiel 24143, Germany
6. School of Engineering, University of Edinburgh 6 , Edinburgh EH10 5HF, United Kingdom